18 – 24 Jun 2025 · Thailand · Wednesday to Tuesday, UTC+7

Thailand weekly air quality

Modelled US AQI · 8 cities · CAMS via Open-Meteo

50.8Weekly mean modelled AQI · Moderate

Mean PM2.5: 10.9 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.

-1.7 AQI compared with the previous week’s mean of 52.5.

Highest hourly estimate: 82 in Khon Kaen · 18 Jun, 14:00 GMT+7.

1344 of 1344 city-hours have a modelled AQI. These are estimates for roughly 45 km model grid cells, not monitoring-station measurements. How this report is made

Daily modelled US AQI

Day	Mean AQI	Low–high	Mean PM2.5 (µg/m³)	City-hours
Wed, 18 Jun	54.9Moderate	28–82	12.2	192 / 192
Thu, 19 Jun	53.4Moderate	24–73	12.1	192 / 192
Fri, 20 Jun	52.9Moderate	18–67	11.5	192 / 192
Sat, 21 Jun	52Moderate	22–68	11.4	192 / 192
Sun, 22 Jun	47.6Good	18–69	8.8	192 / 192
Mon, 23 Jun	46.4Good	19–61	9.6	192 / 192
Tue, 24 Jun	48.7Good	22–67	11	192 / 192

Hourly means (UTC+7)

Each cell averages the selected cities’ modelled AQI for that hour.

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	56	55	55	55	55
Thu	54	54	53	53	53	53	52	52	53	53	53	54	54	54	54	54	54	54	55	54	54	54	54	54
Fri	53	54	54	54	54	54	53	53	53	53	52	52	52	53	53	53	53	53	53	52	52	52	52	52
Sat	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51	51
Sun	51	50	50	50	49	49	49	49	48	48	47	47	47	47	47	47	47	46	46	47	46	46	46	46
Mon	45	45	45	45	45	45	45	45	45	45	46	46	46	47	47	47	48	48	48	49	49	49	48	49
Tue	48	48	47	47	47	47	47	47	48	48	48	49	49	49	49	49	49	50	50	50	50	50	51	52

Cities by modelled US AQI

Sorted by weekly mean. Each city is a single model grid cell near its centre.

City	Mean AQI	Peak AQI	Mean PM2.5 (µg/m³)	Hours
Khon Kaen	63.8Moderate	82	16.3	168 / 168
Chiang Rai	58.9Moderate	68	14	168 / 168
Chiang Mai	58Moderate	67	13.4	168 / 168
Nakhon Ratchasima	55Moderate	60	11.7	168 / 168
Hat Yai	52.1Moderate	58	10.9	168 / 168
Bangkok	50.6Moderate	72	10.3	168 / 168
Phuket	42Good	51	7.6	168 / 168
Pattaya	26.2Good	39	3.5	168 / 168

City-hours by category

Good: 480

Moderate: 864

Unhealthy for Sensitive Groups: 0

Unhealthy: 0

Very Unhealthy: 0

Hazardous: 0

US AQI scale
AQI	Category
0–50	Good
51–100	Moderate
101–150	Unhealthy for Sensitive Groups
151–200	Unhealthy
201–300	Very Unhealthy
301+	Hazardous

How this report is made

Open-Meteo provides hourly estimates from the Copernicus Atmosphere Monitoring Service (CAMS) global model at roughly 45 km resolution. We use the grid cell nearest each city’s centre. Nearby places may share a cell, and local pollution can differ.

The AQI is the provider’s modelled US AQI across pollutants, one value per city per hour. Weekly, daily and hourly means average those values across the selected cities. PM2.5 is a concentration in µg/m³. These figures use a different basis from the measured PM2.5-derived AQI in the Malaysia and Singapore reports.

Days and hours use UTC+7. The report includes past model hours only, never forecasts. The previous-week comparison appears only when at least 90% of that week’s city-hours are available.

For official local readings and advice, visit Pollution Control Department · Air4Thai. Air-quality data: Open-Meteo and CAMS, licensed under CC BY 4.0. Haze Monitor is independent of these providers and local authorities.

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	56	55	55	55	55
Thu	54	54	53	53	53	53	52	52	53	53	53	54	54	54	54	54	54	54	55	54	54	54	54	54
Fri	53	54	54	54	54	54	53	53	53	53	52	52	52	53	53	53	53	53	53	52	52	52	52	52
Sat	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51	51
Sun	51	50	50	50	49	49	49	49	48	48	47	47	47	47	47	47	47	46	46	47	46	46	46	46
Mon	45	45	45	45	45	45	45	45	45	45	46	46	46	47	47	47	48	48	48	49	49	49	48	49
Tue	48	48	47	47	47	47	47	47	48	48	48	49	49	49	49	49	49	50	50	50	50	50	51	52

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	56	55	55	55	55
Thu	54	54	53	53	53	53	52	52	53	53	53	54	54	54	54	54	54	54	55	54	54	54	54	54
Fri	53	54	54	54	54	54	53	53	53	53	52	52	52	53	53	53	53	53	53	52	52	52	52	52
Sat	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51	51
Sun	51	50	50	50	49	49	49	49	48	48	47	47	47	47	47	47	47	46	46	47	46	46	46	46
Mon	45	45	45	45	45	45	45	45	45	45	46	46	46	47	47	47	48	48	48	49	49	49	48	49
Tue	48	48	47	47	47	47	47	47	48	48	48	49	49	49	49	49	49	50	50	50	50	50	51	52

Day	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Wed	54	54	54	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	55	56	55	55	55	55
Thu	54	54	53	53	53	53	52	52	53	53	53	54	54	54	54	54	54	54	55	54	54	54	54	54
Fri	53	54	54	54	54	54	53	53	53	53	52	52	52	53	53	53	53	53	53	52	52	52	52	52
Sat	53	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	52	51	51	51
Sun	51	50	50	50	49	49	49	49	48	48	47	47	47	47	47	47	47	46	46	47	46	46	46	46
Mon	45	45	45	45	45	45	45	45	45	45	46	46	46	47	47	47	48	48	48	49	49	49	48	49
Tue	48	48	47	47	47	47	47	47	48	48	48	49	49	49	49	49	49	50	50	50	50	50	51	52